CN101078846A - Display device - Google Patents

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Publication number
CN101078846A
CN101078846A CNA2007101048648A CN200710104864A CN101078846A CN 101078846 A CN101078846 A CN 101078846A CN A2007101048648 A CNA2007101048648 A CN A2007101048648A CN 200710104864 A CN200710104864 A CN 200710104864A CN 101078846 A CN101078846 A CN 101078846A
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China
Prior art keywords
voltage
storage electrode
display device
electrode
gate
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CNA2007101048648A
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Chinese (zh)
Inventor
李白云
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Theoretical Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)

Abstract

The present invention provides a display device which includes a plurality of gate lines transmitting gate signals wherein each gate signal has a gate-on voltage and a gate-off voltage, a plurality of data lines intersecting the gate lines and transmitting data voltages, a plurality of storage electrode lines extending in parallel to the gate lines and transmitting storage signals, a plurality of pixels arranged in a matrix wherein each pixel includes a switching element connected to a gate line and a data line, a liquid crystal capacitor connected to the switching element and a common voltage, a storage capacitor connected to the switching element and a storage electrode line, and a plurality of storage signal generators generating the storage signals based on the gate signals. The storage signal applied to each pixel has a changed voltage level immediately after the charging the data voltage into the liquid crystal capacitor and the storage capacitor is completed.

Description

Display device
Technical field
The present invention relates to a kind of display device.
Background technology
Usually, LCD comprises two display panels and the liquid crystal layer that has dielectric anisotropy between two panels, and these two display panels have pixel electrode and common electrode.Pixel electrode is pressed matrix arrangements, and is connected to on-off element such as the thin film transistor (TFT) (TFT) that data voltage sequentially is applied to pixel.Common electrode is set at the top on the whole surface of display panel, and provides common-battery to press to common electrode.Pixel electrode, common electrode and liquid crystal layer have constituted liquid crystal capacitor.Liquid crystal capacitor is a pixel cell with on-off element.
Image data voltage changes the intensity of the electric field that is applied to two liquid crystal layers between the panel, thus the optical transmission rate that liquid crystal layer is passed in control, to show image corresponding to data voltage.In order to prevent the deterioration of liquid crystal,, make the polarity of data voltage press counter-rotating with respect to common-battery to every frame, pixel column or pixel.
Yet,, to spend the regular hour and just can reach target voltage so charge into the voltage (below be called pixel voltage) of liquid crystal capacitor because the response speed of liquid crystal molecule is low.This target voltage is the voltage of influence expectation brightness.The above-mentioned time is depended on target voltage and had before charged into poor between the voltage of liquid crystal capacitor.Therefore, when the difference between target voltage and the voltage that before charged into is big, in the time of on-off element conducting, only apply the target voltage deficiency so that pixel voltage reaches target voltage.
In order to address this problem, DCC (dynamic capacitance compensation, dynamic capacitance compensation) scheme has been proposed.The DCC scheme has adopted proportional this fact of the voltage at charging rate and liquid crystal capacitor two ends.The data voltage (be actually poor between pressing of data voltage and common-battery, wherein, common-battery is pressed and is assumed to 0V usually) that selection is applied to pixel makes it be higher than target voltage, reaches the time that target voltage is spent to shorten pixel voltage.Yet, in the DCC scheme, need be used to carry out driving circuit and the frame memory that DCC calculates.Therefore, on circuit design, also there is a difficult problem and improved cost of products.
In order to be reduced in the power consumption in medium-sized or compact display apparatus such as the mobile phone, carried out capable counter-rotating.Yet along with the increase of the resolution of medium-sized or compact display apparatus, power consumption also increases thereupon.Specifically, when carrying out DCC calculating, because calculating and circuit component that other adds cause power consumption to enlarge markedly.
Compare with a counter-rotating, be suitable for utilizing the scope of the capable image data presented voltage that reverses little, wherein, described some counter-rotating is the situation to the polarity of each pixel inversion data voltage.Therefore, in the LCD of VA (vertical orientated) pattern, if drive the threshold voltage height of liquid crystal, the usable range that then is used for the data voltage of the GTG that presentation video shows reduces the amount of threshold voltage.Therefore, the brightness that can not obtain expecting.
Summary of the invention
According to an aspect of the present invention, display device provides the response speed and the image quality that improve under the situation that does not increase power consumption.According to embodiments of the invention, display device comprises: pixel electrode; Common electrode is provided with common-battery and presses; Data driver produces data voltage; Gate drivers produces grid voltage; The pixel switch element according to described grid voltage conducting with end, and offers described pixel electrode with described data voltage when conducting; Holding capacitor comprises partial pixel electrode, storage electrode and therebetween insulator; The storage electrode driver provides booster voltage at least two duration to described storage electrode when described pixel switch element ends.
Described storage electrode driver provides when described pixel switch element conductive and keeps voltage.
Can be from the described data voltage of a group selection the first data voltage group and the second data voltage group.In this case, when from the described data voltage of the described first data voltage group selection, the voltage of described pixel electrode is higher than described common-battery and presses, when from the described data voltage of the described second data voltage group selection, the voltage of described pixel electrode is lower than described common-battery and presses, when from the described data voltage of the described first data voltage group selection, described booster voltage is higher than the described voltage of keeping, when from the described data voltage of the described second data voltage group selection, described booster voltage is lower than the described voltage of keeping.
Described storage electrode driver can comprise voltage source.
Described storage electrode driver can comprise level, and described level comprises: first on-off element has the output terminal that is connected to described storage electrode, is connected to the input end of described voltage source and is connected to the control end in the first control signal source; The second switch element has the output terminal that is connected to described storage electrode, is connected to the input end of described voltage source and is connected to the control end in the second control signal source; The 3rd on-off element has the output terminal that is connected to described storage electrode, is connected to the input end of described voltage source and is connected to the control end in the 3rd control signal source.
Described display device also can comprise many gate lines that are connected to described gate drivers, and the i gate line in described many gate lines is connected to described on-off element and described gate drivers.Described gate drivers order line by line provides the forward voltage pulse to every in many gate lines.Article two, the rising edge of two conducting pulses providing respectively of adjacent gate polar curve separate certain during.Described voltage source can be created in the storage electrode voltage that replaces between first level and second level with the cycle that replaces, and wherein, described second level is higher than described first level.Described alternate cycle can be the twice during described.In this case, the described first control signal source can be described i gate line, and the described second control signal source can be the i+2K+1 gate line, and described the 3rd control signal source can be described i+2N+1 gate line.Here, K is natural number or 0, and N is the natural number greater than K.
Described display device also can comprise 2N+1 bar added gate polar curve.
In addition, described voltage source also can comprise: first voltage source, be created in the first storage electrode voltage that replaces between first level and second level with the cycle that replaces, and described second level is higher than described first level; Second voltage source produces the second storage electrode voltage have with the phase place opposite phases of the described first storage electrode voltage.
In this case, the described input end of described first on-off element is connected in described first voltage source and described second voltage source, described second and the input end of the 3rd on-off element be connected in described first voltage source and described second voltage source another, the described cycle that replaces can be the twice of frame.The described first control signal source is described i gate line, and the described second control signal source is the i+K+1 gate line, and described the 3rd control signal source is described i+N+1 gate line.Here, K is natural number or 0, and N is the natural number greater than K.Described display device also can comprise N+1 bar added gate polar curve.
Can alternately select described data voltage frame by frame from described first data voltage group and the described second data voltage group.
Described display device also can comprise the storage electrode connecting line, and wherein, an end of described storage electrode connecting line connects described first output terminal to described the 3rd on-off element jointly, and the other end is connected to described storage electrode.Described display device also can comprise the electric capacity of the voltage of keeping storage electrode.
Described electric capacity can comprise: first electric capacity comprises the described storage electrode connecting line of part, first electrode and first insulation course between described part storage electrode and described first electrode; Second electric capacity comprises described part storage electrode connecting line, second electrode and second insulation course between described part storage electrode connecting line and described second electrode.
Described part storage electrode connecting line can be between described first insulation course and described second insulation course.Described first electrode and described second electrode can be electrically connected mutually.
Description of drawings
Describe exemplary embodiment of the present invention with reference to the accompanying drawings in detail, in the accompanying drawings:
Fig. 1 is the block diagram according to the LCD of exemplary embodiment of the present invention;
Fig. 2 is the equivalent circuit diagram according to a pixel in the LCD of exemplary embodiment of the present invention;
Fig. 3 is the circuit diagram according to the example of the storage electrode driver of exemplary embodiment of the present invention;
Fig. 4 is the sequential chart of signal that is used to comprise the LCD of the signal generating circuit shown in Fig. 3;
Fig. 5 is the circuit diagram according to another example of the storage electrode driver of exemplary embodiment of the present invention;
Fig. 6 is the sequential chart of signal that is used to comprise the LCD of the signal generating circuit shown in Fig. 5;
Fig. 7 is the layout according to the example of the LCD of the embodiment of the invention;
Fig. 8 A and Fig. 8 B are respectively the cut-open views along the thin-film transistor display panel of line XIIa-XIIa among Fig. 7 and XIIb-XIIb intercepting.
Embodiment
In the accompanying drawings, for clear, exaggerated the thickness in layer, film, panel, zone etc.Should be appreciated that, when element such as layer, film, zone or substrate be known as another element " on " time, can perhaps also can there be intermediary element in this element directly on another element.On the contrary, when element be known as " directly " another element " on " time, do not have intermediary element.Describe LCD in detail with reference to Fig. 1 and Fig. 2 according to exemplary embodiment of the present invention.
Fig. 1 is the block diagram according to the LCD of exemplary embodiment of the present invention, and Fig. 2 is the equivalent circuit diagram according to a pixel in the LCD of exemplary embodiment of the present invention.
As shown in Figure 1, LCD comprises liquid crystal panel assembly 300, gate drivers 400, data driver 500, storage electrode driver 700, is connected to the grayscale voltage generator 800 of data driver 500 and controls the signal controller 600 of these parts.
Liquid crystal panel assembly 300 comprises many signal line G 1-G n, D 1-D mAnd S 1-S nAnd be connected to signal wire G 1-G n, D 1-D mAnd S 1-S nAnd substantially by a plurality of pixel PX of matrix arrangements.In the configuration diagram, liquid crystal panel assembly 300 comprises lower panel 100 and top panel 200 and the liquid crystal layer 3 between lower panel 100 and top panel 200 that faces with each other shown in figure 2.Signal wire comprises many gate lines G 1-G n, many data line D 1-D mWith many storage electrode line S 1-S n
Storage electrode line S 1-S nBeing connected to the storage electrode driver also extends on the direction identical with the direction of gate line extension substantially.
With reference to Fig. 2, each pixel PX for example is connected to the i gate lines G i(i=1,2 ..., n) with j data line D j(j=1,2 ..., pixel PX m) comprises: pixel switch element Q is connected to signal wire G iAnd D jLiquid crystal capacitor Clc and holding capacitor Cst are connected to pixel switch element Q.
Pixel switch element Q is three terminal components such as thin film transistor (TFT), and is set on the lower panel 100.Pixel switch element Q has the gate lines G of being connected to iControl end, be connected to data line D jInput end and be connected to liquid crystal capacitor Clc and the output terminal of holding capacitor Cst.
Liquid crystal capacitor Clc comprises the common electrode 270 as the pixel electrode 191 and the top panel 200 of the lower panel 100 of two electrodes, and as dielectric liquid crystal layer 3 between two electrodes.Pixel electrode 191 is connected with pixel switch element Q.Common electrode 270 is set on the whole surface of top panel 200, and is provided with common-battery pressure Vcom, and wherein, it is the dc voltage with predetermined value that common-battery is pressed Vcom.
Common electrode 270 can be set on the lower panel 100.
By with pixel electrode 191 and storage electrode line S iStacked and have insulator betwixt and construct holding capacitor Cst.
With reference to Fig. 1, the grayscale voltage that the transmissivity with pixel PX of grayscale voltage generator 800 generation somes is relevant (below, be called " benchmark grayscale voltage ").
Gate drivers 400 produces signal and signal is outputed to gate line.Each signal has forward voltage Von and cut-off voltage Voff.
Gate drivers 400 can with signal wire G 1-G n, D 1-D mAnd S 1-S n, on-off element Q and pixel electrode be integrated in the liquid crystal panel assembly 300 together.Selectively, gate drivers 400 can comprise with carrier band encapsulation (TCP) form and invests flexible print circuit (FPC) film of LC panel assembly 300 or be installed at least one integrated circuit (IC) chip on the LC panel assembly 300.
Signal controller 600 control gate drivers 400 and data driver 500.Signal controller 600 receives received image signal R, G and B and input control signal from the external graphics controller (not shown).Received image signal R, G and B comprise the monochrome information of pixel PX.This brightness has the gray level (gray level) of predetermined quantity, and for example 1024 (=2 10), 256 (=2 8) or 64 (=2 6) individual gray scale.Input control signal comprises vertical synchronizing signal Vsync, horizontal-drive signal Hsync, master clock signal MCLK and data enable signal DE.
Signal controller 600 is based on input control signal and received image signal R, G and B processing picture signal R, G and B, to produce grid control signal CONT1 and data controlling signal CONT2, be transferred to corresponding driver subsequently and with grid control signal CONT1 and the data controlling signal CONT2 that produces.
Grid control signal CONT1 comprises: scanning start signal STV is used for beacon scanning and begins; At least one clock signal is used to control output cycle of forward voltage Von.Grid control signal CONT1 also can comprise the output enable signal OE of the duration that is used to define forward voltage Von.
Data controlling signal CONT2 comprises: horizontal synchronization start signal STH, the data transmission that is used to indicate one-row pixels PX; Load signal LOAD is used for order data voltage is applied to data line D 1-D mData clock signal HCLK.Data controlling signal CONT2 can comprise that also the polarity that is used to make data voltage presses the reverse signal RVS of Vcom counter-rotating with respect to common-battery.
Response is from the data controlling signal CONT2 of signal controller 600, data driver 500 receives the bag of the data image signal DAT of one-row pixels PX, and convert data image signal DAT to be selected from grayscale voltage analog data voltage, and analog data voltage is applied to data line D 1-D m
Gate drivers 400 responses are applied to gate lines G with forward voltage Von line by line from the grid control signal CONT1 of signal controller 600 1-G n, and the on-off element Q that is connected with the gate line that is applied in forward voltage Von of conducting.
Then, the on-off element Q by conducting will be applied to data line D 1-D mData voltage be provided to pixel PX, thereby to the liquid crystal capacitor Clc among the pixel PX and holding capacitor Cst charging.
Storage electrode driver 700 is connected to storage electrode line S 1-S n, and apply storage voltage.Storage voltage has two level, and one in two level is low level, and another is a high level.
Storage electrode driver 700 can with signal wire G 1-G n, D 1-D mAnd S 1-S n, on-off element Q and pixel electrode be integrated on the liquid crystal panel assembly 300 together.Storage electrode driver 700 also can be integrated circuit (IC) chip on flexible print circuit (FPC) film that is installed in LC panel assembly 300 or invests panel assembly 300.
When forward voltage is applied to gate lines G iThe time, storage electrode driver 700 is provided to storage electrode line S with one in high level voltage or the low level voltage as keeping voltage i, wherein, this storage electrode line S iStacked with the pixel column that is connected to described gate line.Simultaneously, when cut-off voltage was applied to described gate line, with more than twice different interval, another level voltage was provided to described storage electrode line S as booster voltage (boostingvoltage) i
Thereby the voltage of the pixel electrode of being floated in the i pixel column 191 changes according to the change in voltage of storage electrode line.By all pixel columns being repeated this process, the image of liquid crystal display displays one frame.
Group selection data voltage from the first data voltage group and the second data voltage group.Determine the data voltage of the first data voltage group, make when booster voltage is applied to storage electrode line that the voltage of pixel electrode is higher than common-battery and presses.When from the first data voltage group selection data voltage, described data voltage has positive polarity.
On the other hand, determine the data voltage of the second data voltage group, make when booster voltage is applied to storage electrode line that the voltage of pixel electrode is lower than common-battery and presses.When from the second data voltage group selection data voltage, described data voltage has negative polarity.
When next frame began, control was applied to the reverse signal RVS of data driver 500, thereby the polarity of data voltage is inverted (this is called " frame counter-rotating ").In addition, the polarity of data voltage of pixel PX that is applied to delegation is basic identical, and is applied to the polarity opposite (so-called " row counter-rotating ") of data voltage of the pixel PX of two adjacent lines.
Because carry out frame counter-rotating and row counter-rotating, be positive or negative so be applied to the polarity of all data voltages of the pixel PX of delegation, and every frame is changed according to the LCD of exemplary embodiment of the present invention.
When utilizing the positive polarity data voltage, be applied to storage electrode line S to pixel electrode 191 chargings 1-S nStorage voltage from become high level voltage as the low level voltage of keeping voltage as booster voltage.At this moment, pixel electrode is floated by electricity, thereby by the capacitive coupling between storage electrode and the pixel electrode, the voltage of storage electrode increases makes pixel electrode voltage increase.
On the other hand, when the data voltage with negative polarity charged to pixel electrode 191, storage voltage was from changing into the low level voltage as booster voltage as the high level voltage of keeping voltage.Owing to capacitive coupling, the reduction of storage electrode voltage makes pixel electrode voltage reduce like this.
Therefore, the voltage range of pixel electrode 191 can be wider than the scope based on the grayscale voltage of data voltage, thereby has increased the brightness range of utilizing low basic voltage (basic voltage).
Press difference between the size of Vcom to be expressed as the voltage at the liquid crystal capacitor Clc two ends of pixel PX with being applied to the pixel electrode voltage of pixel PX and common-battery, be called pixel voltage.Liquid crystal molecule among the liquid crystal capacitor Clc has the orientation of the size that depends on pixel voltage, and molecular orientation determines to pass the polarisation of light of liquid crystal layer 3.Polarizer is transformed into transmittance with light polarization, thereby pixel PX has the brightness of being represented by the gray scale of data voltage.
Explain embodiment with reference to Fig. 3 and Fig. 4 according to storage electrode driver of the present invention.
Fig. 3 is the circuit diagram of storage electrode driver according to an exemplary embodiment of the present invention, and Fig. 4 shows the sequential chart of the signal that uses in the LCD that comprises storage electrode driver shown in Figure 3.
The storage electrode driver has multistage (stage), and every grade is connected to storage electrode line.In Fig. 3, i level and i+1 level are described as STAGEi and STAGEi+1 respectively.
Every grade comprises three or more on-off elements.As one of simple embodiment, Fig. 3 shows has three transistorized levels as on-off element.
The first transistor Qi.1 of i level STAGEi has source electrode as input end, as the drain electrode of output terminal with as the grid of control end.The source electrode of the first transistor Qi.1 is connected to storage electrode line driving voltage source V by storage electrode line drive voltage supply line SL SLThe drain electrode of the first transistor Qi.1 is connected to i storage electrode line S iThe grid of the first transistor Qi.1 is connected to the i gate lines G i
The transistor seconds Qi.2 of i level STAGEi has source electrode as input end, as the drain electrode of output terminal with as the grid of control end.The source electrode of transistor seconds Qi.2 is connected to storage electrode line driving voltage source V by storage electrode line drive voltage supply line SL SLThe drain electrode of transistor seconds Qi.2 is connected to i storage electrode line S iThe grid of transistor seconds Qi.2 is connected to the i+1 gate lines G I+1
The 3rd transistor Qi.3 of i level STAGEi has source electrode as input end, as the drain electrode of output terminal with as the grid of control end.The source electrode of the 3rd transistor Qi.3 is connected to storage electrode line driving voltage source V by storage electrode line drive voltage supply line SL SLThe drain electrode of the 3rd transistor Qi.3 is connected to i storage electrode line S iThe grid of the 3rd transistor Qi.3 is connected to the i+3 gate lines G I+3
As shown in Figure 4, storing driver voltage V SLAt high level voltage V HWith low level voltage V LBetween alternately.Cycle alternately is about 2H, and the duration of each voltage level is basic identical, and in other words, the duration of each voltage level is about 1H.
With reference to Fig. 3 and Fig. 4, when conduction level Von was applied to the i gate line, the polarity that is applied to the data voltage of the pixel that is connected with the i gate line was positive.
Simultaneously, the first transistor Qi.1 conducting, and with low level V LOffer storage electrode line S i
After past, be applied to the i gate lines G at about 1H iVoltage become cut-off level Voff, be applied to the i+1 gate lines G I+1Voltage become conduction level Von.
Simultaneously, transistor seconds Qi.2 is by the Von conducting of i+1 gate line, and with high level V HOffer i storage electrode line S i
Therefore, i storage electrode line S iVoltage from V LBecome V H, like this because i storage electrode line and be connected to capacitive coupling between the pixel electrode of i gate line and changed and be connected to the i gate lines G iThe voltage of pixel.
On the other hand, as shown in Figure 4, at next frame, data voltage V DPolarity become negative, and in the i gate lines G iThe ON time section during, the storage electrode line driving voltage is high level V HWhen the i+1 gate lines G I+1Voltage when Voff becomes Von, storing driver voltage V SLFrom V HBecome V L
Relation between equation 1 remarked pixel change in voltage and the storage electrode line voltage.Here, V PBe pixel voltage, V DBe in the i gate lines G iThe ON time section during charge into and be connected to the i gate lines G iThe data voltage of pixel.
Equation 1
V p = V D ± C st C st + C lc ( V H - V L )
When data voltage has positive polarity, V DAfter symbol be just (+), when data voltage has negative polarity, V DAfter symbol be negative (-).
Can select data voltage V according to the characteristic of LC panel DScope.As embodiment, in positive polarity in the time period, for example has the voltage group selection data voltage V of the 0V of the 5V of maximum gray scale and minimal gray level from having voltage range DIn negative polarity in the time period, from having and the voltage group of the positive polarity reverse order data voltage V of the voltage group selection of the 5V of the 0V of maximum gray scale and minimal gray level for example DIn this case, no matter polarity is positive or negative, and the difference between the data voltage of the data voltage of gray level and maximum gray scale or minimal gray level is basic identical.In above-mentioned example, then identical with the data voltage difference of maximum gray scale if the data voltage of the 125th gray level is the 3V of positive polarity and the 2V of negative polarity to each polarity, be 2V.
In this embodiment, even the grid of the transistor seconds of i level is connected to next stage i+1 level, the level of the storing driver voltage that provides when transistor seconds and the level of the storing driver voltage that the first transistor provides also can differently be constructed this connection not simultaneously.
Because the level of the storing driver voltage that applies by conducting the 2nd TFT is different from the level of the storing driver voltage that applies by the conducting the first transistor, so the grid that possible modification is the transistor seconds in the i level is connected to the i+2K+1 gate line.
Here, K is natural number or zero.Be that to every grade, the grid of transistor seconds is connected to next gate line under 0 the situation at K.
Transistor seconds Qi.2 has stray capacitance between its drain and gate.When transistor seconds Qi.2 conducting, this stray capacitance is responded to forward voltage and forward voltage is charged into drain electrode, and the electric charge of these inductions flows into storage electrode, thereby pixel voltage is descended.Amount and stray capacitance that pixel voltage descends are proportional.Therefore, in order to reduce the decline of storage voltage, need reduce stray capacitance.
On the other hand, the size of transistor seconds needs enough big, and to drive whole storage capacitor line, this is a restriction to reducing stray capacitance.
In order to address this problem, storage electrode driver of the present invention is providing storing driver voltage to pixel charging back more than twice ground.
When Von is applied to the i+3 gate line, the 3rd transistor Qi.3 conducting, and with high level V HOffer the i storage electrode line once more.
Therefore, because supplying with the duration change, booster voltage is doubled, so can reduce each transistorized size in transistor seconds and the 3rd transistor.
Since next gate line that the transistor seconds of afterbody need be attached thereto, and each the 3rd transistor of 2N+1 level needs following 2N+1 gate line respectively at last, so liquid crystal panel can comprise 2N+1 bar added gate polar curve.
For example, when liquid crystal panel has 100 gate lines and 100 storage electrode lines, and N is 1 o'clock, and the 3rd transistorized grid in the 98th grade, the 99th grade and the 100th grade need be with the 101st gate line, the 102nd gate line and the 103rd gate line that is attached thereto respectively.Described the 101st gate line, the 102nd gate line and the 103rd gate line are the added gate polar curve, and the forward voltage of order displacement is applied to described added gate polar curve, and described added gate polar curve is not connected with pixel transistor.
Replacement forms the added gate polar curve on liquid crystal panel, the output terminal of the Continuity signal that output can be shifted in proper order is connected to the 3rd transistorized grid of last 2N+1 level.
Even above-mentioned disclosed embodiment only has the 3rd transistor, every grade also can comprise additional transistor and storage electrode line, so that enough electric charges are supplied with storage electrode line.
In this case, when extra transistor must conducting, the level of the storing driver voltage that the conducting by additional TFT applies was identical with the level of the storing driver voltage that applies by the 3rd transistorized conducting.
For example, every grade of the storage electrode driver can comprise the 4th transistor, and described the 4th transistor has the source electrode that is connected to the storing driver voltage source, is connected to the drain electrode of storage electrode line and is connected to the i+5 gate lines G I+5Grid.
Since storing driver voltage with cycle of about 2H alternately, so when conduction level was applied to the i+5 gate line, storage voltage was the high level V of the identical level of the level during with the 3rd transistor turns H
And every grade of the storage electrode driver can comprise the 5th transistor etc., and described the 5th transistor has the source electrode that is connected to the storing driver voltage source, is connected to the drain electrode of storage electrode line and is connected to the i+7 gate lines G I+7Grid.
Usually, for the first above-mentioned embodiment, the 3rd transistorized grid of i level can be connected to the i+2N+1 gate line, and the grid of the extra transistor except basic three transistor Qi.1, Qi.2 and Qi.3 can be connected to the i+2M+1 gate line.Here, N is the natural number greater than K, and M is the natural number greater than N.
Explain another embodiment with reference to Fig. 5 and Fig. 6 according to storage electrode driver 700 of the present invention.
The storage electrode driver comprises the first driving voltage source V SL1With the second driving voltage source V SL2
As shown in Figure 6, each alternate cycle with about 2 frames in the first driving voltage source and the second driving voltage source is created in the driving voltage that replaces between high level and the low level.The phase place of the alternate voltages that these two driving voltage sources produce is opposite each other.
Every grade of the storage electrode driver comprises three transistors, and each transistor has the drain electrode that is connected to identical storage electrode line.
For level, the source electrode of the first transistor is connected to one of the first driving voltage source and second driving voltage source, and transistor seconds and the 3rd transistorized source electrode are connected to another in the first driving voltage source and the second driving voltage source.
On the other hand, the source electrode of the first transistor in of two adjacent levels is connected to one of the first driving voltage source and second driving voltage source, and the source electrode of the first transistor in another grade is connected to another driving voltage source.
With reference to Fig. 5 said structure is described as example.
Three transistor Qi.1, Qi.2 of i level and each among the Qi.3 are connected to the i storage line.
The first transistor Qi.1 has the grid that is connected to the i gate line and is connected to the first driving voltage source V SL1Source electrode.
Transistor seconds Qi.2 has the grid that is connected to the i+1 gate line and is connected to the second driving voltage source V SL2Source electrode.
The 3rd transistor Qi.3 has the grid that is connected to the i+2 gate line and is connected to the second driving voltage source V SL2Source electrode.
Three transistor Qi+1.1, Qi+1.2 of i+1 level and each among the Qi+1.3 are connected to the i+1 storage line.
The first transistor Qi+1.1 has the grid that is connected to the i+1 gate line and is connected to the second driving voltage source V SL2Source electrode.
Transistor seconds Qi+1.2 has the grid that is connected to the i+2 gate line and is connected to the first driving voltage source V SL1Source electrode.
The 3rd transistor Qi+1.3 has the grid that is connected to the i+3 gate line and is connected to the first driving voltage source V SL1Source electrode.
When the conducting of i gate line, the first transistor conducting also simultaneously will be from the first driving voltage source V SL1What produce offers the i storage electrode line for low level driving voltage.
When about 1H of past time, the i gate line ends, the conducting of i+1 gate line.Therefore, the transistor seconds conducting, and will be from the second driving voltage source V SL2What produce offers the i storage electrode line for the driving voltage of high level.
When the time when removing about 1H, the i+1 gate line ends, the conducting of i+2 gate line.Therefore, the 3rd transistor turns, and will be from the second driving voltage source V SL2What produce offers the i storage electrode line for the driving voltage of high level.
That explains among the mechanism that raises pixel voltage and keep storage voltage by transistor seconds and the 3rd transistor and first embodiment is identical.
As illustrated among first embodiment, every grade can comprise extra transistor.
Usually, the grid of the transistor seconds of i level can be connected to the i+K gate line.For second embodiment, the 3rd transistorized grid of i level can be connected to the i+N gate line, except the grid of three basic transistor Qi.1, Qi.2 and the extra transistor the Qi.3 can be connected to the i+M gate line.Here, K is a natural number, and N is the natural number greater than K, and M is the natural number greater than N.
Because the 3rd transistor of each of last N level needs following N gate line respectively, so liquid crystal panel can comprise N bar added gate polar curve.
For example, when liquid crystal panel has 100 gate lines and 100 storage electrode lines, and N is 2 o'clock, and the 3rd transistorized grid in the 99th grade and the 100th grade needs the 101st gate line and the 102nd gate line that are attached thereto respectively.These the 101st gate lines and the 102nd gate line are the added gate polar curve, and wherein, the forward voltage of order displacement is applied to the added gate polar curve, and described added gate polar curve is not connected with pixel transistor.
Substitute and form the added gate polar curve on liquid crystal panel, the output terminal of the Continuity signal that output is shifted in proper order can be connected to the 3rd transistorized grid of last N level.
Every grade of the storage electrode driver can be formed on the liquid crystal panel.Fig. 7 is the planimetric map of the array on the liquid crystal panel, and Fig. 8 A and Fig. 8 B are respectively the line XIIa-XIIa in Fig. 7 and the cut-open view of line XIIb-XIIb intercepting.
Many gate lines 121 and many storage electrode lines 131 and at least one the first electrode wires 197 are set on the dielectric base of making by clear glass or plastics 110.
Gate line 121 comprises: gate electrode 124, and outstanding from gate line 121; The end (not shown) has the wide surf zone that is used to connect other layer or external drive circuit.
Every in the storage electrode line 131 comprises a plurality of enlarged 137.
First electrode wires 197 is mainly extended on the direction of intersecting with gate line, and comprises a plurality of enlarged 197a.
On gate line 121, storage electrode line 131 and first electrode wires 197, form gate insulator 140.
On gate insulator 140, form a plurality of semiconductor layers 151.
On semiconductor layer 151, form the Ohmic contact 161 and 165 of a plurality of linear and island shapes.Ohmic contact 161 and 165 can have the n+ amorphous silicon hydride or the silicide of n type impurity such as phosphorus to make by heavy doping.
Respectively Ohmic contact 161 and 165 and gate insulator 140 on form many data lines 171, a plurality of drain electrode 175 and many storage electrode connecting lines 196.
Every drain electrode that is connected to the on-off element of storage electrode driver in the storage electrode connecting line 196.At least the part of storage electrode connecting line 196 is stacked with the enlarged of first electrode wires 197.
In substrate, form passivation layer 180.Passivation layer 180 can be made by inorganic insulating material or organic insulation, and has the surface of planarization.Described insulating material can be silicon nitride and monox.Organic insulation can have photonasty, and its specific inductive capacity is preferably about 4.0 or littler.Optionally, it is that inorganic layer and upper strata are the double-decker of organic layer that passivation layer 180 can have lower floor, with the good insulation performance performance of keeping organic layer and the exposed portions of protecting semiconductor layer 151.
On passivation layer 180, form a plurality of contact holes 182,183 and 185 of the end that exposes data line 171, storage electrode connecting line 196 and drain electrode 175 respectively.On passivation layer 180 and gate insulator 140, form a plurality of contact holes 184 that expose storage electrode line 131.
On passivation layer 180, form a plurality of pixel electrodes 191, a plurality of contact bridge and at least one second electrode 198.
Pixel electrode 191 by contact hole 185 and drain electrode 175 physically and be electrically connected, and the data voltage that applies of reception drain electrode 175.
Every storage electrode line is connected to second electrode 198 by contact hole 183 and 184.
Second electrode 198 is connected to first electrode wires 197 by contact hole 181, and stacked with storage electrode connecting line 196.
Between the storage electrode connecting line 196 and first electrode wires 197, form first electric capacity, between the storage electrode connecting line 196 and second electrode 198, form second electric capacity.These two electric capacity are kept storage electrode voltage after applying last driving voltage.
Although described the present invention in conjunction with being considered to practicable exemplary embodiment at present, but will be understood by those skilled in the art that, the invention is not restricted to disclosed embodiment, on the contrary, intention covers various modifications and the equivalent arrangement in the spirit and scope that are included in claim.

Claims (25)

1, a kind of display device comprises:
Pixel electrode;
Common electrode is provided with common-battery and presses;
Data driver produces data voltage;
Gate drivers produces grid voltage;
The pixel switch element according to described grid voltage conducting with end, and offers described pixel electrode with described data voltage when conducting;
Holding capacitor comprises partial pixel electrode, storage electrode and therebetween insulator;
The storage electrode driver provides booster voltage at least two duration to described storage electrode when described pixel switch element ends.
2, display device according to claim 1, described storage electrode driver provide when described pixel switch element conductive and keep voltage.
3, display device according to claim 2, the described data voltage of a group selection from the first data voltage group and the second data voltage group.
4, display device according to claim 3, when from the described data voltage of the described first data voltage group selection, the voltage of described pixel electrode is higher than described common-battery and presses, when from the described data voltage of the described second data voltage group selection, the voltage of described pixel electrode is lower than described common-battery and presses.
5, display device according to claim 4, when from the described data voltage of the described first data voltage group selection, described booster voltage is higher than the described voltage of keeping, and when from the described data voltage of the described second data voltage group selection, described booster voltage is lower than the described voltage of keeping.
6, display device according to claim 5, described storage electrode driver comprises voltage source.
7, display device according to claim 6, described storage electrode driver also comprises level, described level comprises: first on-off element has the output terminal that is connected to described storage electrode, is connected to the input end of described voltage source and is connected to the control end in the first control signal source; The second switch element has the output terminal that is connected to described storage electrode, is connected to the input end of described voltage source and is connected to the control end in the second control signal source; The 3rd on-off element has the output terminal that is connected to described storage electrode, is connected to the input end of described voltage source and is connected to the control end in the 3rd control signal source.
8, display device according to claim 7, described voltage source is created in the storage electrode voltage that replaces between first level and second level with the cycle that replaces, and wherein, described second level is higher than described first level.
9, display device according to claim 8, also comprise many gate lines that are connected to described gate drivers, described gate drivers sequentially provides the forward voltage pulse to every in many gate lines line by line, wherein, article two, the rising edge of two conducting pulses providing respectively of adjacent gate polar curve separate certain during, the i gate line in described many gate lines is connected to described on-off element and described gate drivers.
10, display device according to claim 9, wherein, described alternate cycle is the twice during described.
11, display device according to claim 10, wherein,
The described first control signal source is described i gate line, and the described second control signal source is the i+2K+1 gate line, and described the 3rd control signal source is described i+2N+1 gate line;
K is natural number or 0, and N is the natural number greater than K.
12, display device according to claim 11 also comprises 2N+1 bar added gate polar curve.
13, display device according to claim 7, described voltage source also comprises:
First voltage source is created in the first storage electrode voltage that replaces between first level and second level with the cycle that replaces, and described second level is higher than described first level;
Second voltage source produces the second storage electrode voltage have with the phase place opposite phases of the described first storage electrode voltage.
14, display device according to claim 13, wherein, the described input end of described first on-off element is connected in described first voltage source and described second voltage source, described second and the input end of the 3rd on-off element be connected in described first voltage source and described second voltage source another.
15, display device according to claim 14, wherein, the described cycle that replaces is the twice of frame.
16, display device according to claim 15,
Wherein, the described first control signal source is described i gate line, and the described second control signal source is the i+K+1 gate line, and described the 3rd control signal source is described i+N+1 gate line;
Wherein, K is natural number or 0, and N is the natural number greater than K.
17, display device according to claim 16 also comprises N+1 bar added gate polar curve.
18, it is identical that display device according to claim 1, each of described duration and described pixel switch element are switched on the time that is continued.
19, display device according to claim 5 is alternately selected described data voltage frame by frame from described first data voltage group and the described second data voltage group.
20, display device according to claim 9 also comprises the storage electrode connecting line, and an end of described storage electrode connecting line connects described first output terminal to described the 3rd on-off element jointly, and the other end is connected to described storage electrode.
21, display device according to claim 20 also comprises the electric capacity of the voltage of keeping described storage electrode.
22, display device according to claim 21, described electric capacity comprises:
First electric capacity comprises the described storage electrode connecting line of part, first electrode and first insulation course between described part storage electrode and described first electrode;
Second electric capacity comprises described part storage electrode connecting line, second electrode and second insulation course between described part storage electrode connecting line and described second electrode.
23, display device according to claim 22, wherein, described part storage electrode connecting line is between described first insulation course and described second insulation course.
24, display device according to claim 23, wherein, the voltage that is applied to described first electrode is identical with the voltage that is applied to described second electrode.
25, display device according to claim 24, wherein, described first electrode and described second electrode are electrically connected mutually.
CNA2007101048648A 2006-05-23 2007-05-23 Display device Pending CN101078846A (en)

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US8242996B2 (en) 2012-08-14

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Application publication date: 20071128